That is the conclusion of researchers at Cornell University who analyzed 38 million articles about the pandemic in English-language media around the world. Mentions of Mr. Trump made up nearly 38 percent of the overall “misinformation conversation,” making the president the largest driver of the “infodemic” — falsehoods involving the pandemic…

But by far the most prevalent topic of misinformation topic was “miracle cures,” including Mr. Trump’s promotion of anti-malarial drugs and disinfectants as potential treatments for Covid-19, the disease caused by the coronavirus. That accounted for more misinformation than the other 10 topics combined, the researchers reported…

For example, on April 24, a day after Mr. Trump floated — and was ridiculed for — the idea that disinfectants and ultraviolet light might treat Covid-19, there were more than 30,000 articles in the “miracle cures” category, up from fewer than 10,000 only days earlier. Mr. Trump drove those increases, the study found.